Visiting Webpage ONLY after another page was visited. Possible?

Question

I am looking for a way to solve the following problem:

User should only be able to visit mywebsite.com/page2 after they visited mywebsite.com/page1.

If a user was not on page1, he or she should not be able to visit page2.

Is this possible?

Further specification: On page1 should be a survey (plugin: "Contact Form 7") and people are redirected to page2 after submitting their answers.

Answer 1

You could set a cookie upon contact form submission, then check for the cookie on /page2. If it is not found, wp_safe_redirect() back to /page1.

Setting a cookie - You will need to hook into Contact Form 7's submission - look into their documentation:

<?php
setcookie( 'my_cookies_name', true, 0 ); // This cookie will expire after the session
?>

Retreiving the cookie (on /page2's php template:

<?php
if( is_page('page2') ) {
    // Because the value is set to true, you can just check for the value in if()
    if( ! $_COOKIE['my_cookies_name'] ) {
        // cookie isn't found, redirect back
        wp_safe_redirect( site_url('/page1') );
    }
}
?>